Energetic hot electrons from magnetically doped semiconductor nanostructures and their application in photocatalysis

Energetic hot
electrons from magnetically doped semiconductor nanostructures and their
application in photocatalysis

■Date: 2017. 07.
07(FRI) 10:30 ~ 12:00

■ Place: Science BuildingⅠ, Room.202 Multimedia Room

■ Speaker: Prof. Dong Hee Son(Dept.
Chemistry, Texas A&M Univ.)

■ Host of a Seminar: Prof. Unyong Jeong

■Abstract:

This presentation will discuss several photophysical
properties of Mn-doped semiconductor nanostructure focusing on the energy and
charge transfer processes and generation of highly energetic non-plasmonic hot
electrons. The materials of interest are Mn-doped II-VI semiconductor quantum
dots and Mn-doped cesium lead halide (CsPbX3) perovskite nanocrystals.
Because of the efficient exchange coupling between exciton and d electrons of
the dopant ions, Mn-doped semiconductor quantum dots exhibit several unique
optical and magnetic properties including sensitized dopant luminescence and
generation of highly energetic hot electrons via sequential exciton-to-hot
carrier upconversion process. This presentation will discuss the structural
correlation of the exciton-to-Mn energy transfer dynamics and hot electron
generation efficiency. The application of highly energetic hot electrons,
capable of photoemission even above the vacuum level under weak cw bandgap
excitation, will be discussed using photocatalytic H2 production as the test
platform. Part of the presentation will also cover the recent progress made in
our laboratory on the synthesis of Mn-doped and undoped CsPbX3 nanocrystals of
varying structural anisotropy and the study of the energy and charge transfer
process.